Stanford, Jon D.
John Wiley and Sons Australasia Pty , 1973
Buku Teks
Luckett, Dudley G., author
McGraw-Hill , 1984
Buku Teks
Fry, Maxwell J.
Routledge, 1996
Buku Teks
Silalahi, Pristanto, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2022
UI - Tesis (Membership)
Cencini, Alvaro
Routledge , 1997
Buku Teks